Electric cable shield termination



Dec. 2, 1958 A. M. SCHMIDT 2,862,993

ELECTRIC CABLE SHIELD TERMINATION Filed Aug. 3l, 1953 2 Sheets-Sheet 1 INVENTOR MAS/c /zmidi' QL; L*

ATTORNEYS' Dec. 2, 1958 A. M. SCHMIDT 2,862,993

ELECTRIC CABLE SHIELD TERMINATION Filed Aug. 31, 195s 2 sheets-sheet 2 ATTORNEYS nrncriuc canta Sinnen rant/invariant Albert M. Schmidt, Washington, l). C., assigner to AMP Incorporated, a corporation of New `ierscy Application August 31, 1953, Serial No. 377,413

4 Claims. (Cl. 174-75) This invention relates to a shield termination for electric conductors having a woven or twisted wire shield.

In a wire conductor having a Woven wire shield about the ineulating sheath, and a braided or woven cover about the shield, when the conductor is connected to a terminal, the insulation, shield and cover must be cut back and skinned from the wire. Unless some covering is provided for these elements, they become frayed and form an electrical hazard, as well as forming an unprofessional wire connection. t is, therefore, an object of this invention to provide a means whereby the ends of the shield and cover may be grounded, and may be tightly secured.

Another object of this invention is to provide a shield termination which can be easily applied to a conductor, and which will produce a professional termination.

A further object of this invention is to provide a shield termination which will permit grounding of the shield or connection of a series of shields together.

A further object of this invention is to provide a shield termination which may be used with either single or multiple wire conductors.

With the above and other objects in View, my invention consists in the arrangement, combination and details of construction disclosed in the drawings and specification and then more particularly pointed out in the appended claims.

In the drawings:

Figure l is a detailed side elevation of a wire having a shield termination means mounted adjacent the opposite ends thereof.

Figure 2 is a fragmentary side elevation showing the rst step in mounting the termination on the wire.

Figure 3 is a fragmentary side elevation partly in section showing the second step in mounting the termination on the wire.

Figure 4 is a detailed side elevation partly in section showing the third step in mounting the termination on the wire.

Figure 5 is a longitudinal section partly in detail, showing the fourth step in mounting the termination on the wire.

Figure 6 is a longitudinal section partly in detail showing the next step in assembling the termination on the wire.

Figure 7 is a detailed side elevation partly in section showing a further step in assembling the termination on the wire.

Figure 8 is a detailed side elevation showing the completely assembled termination on the Wire.

Figure 9 is a longitudinal section on an enlarged scale of the termination in completely assembled condition.

Figure l0 is a detailed side elevation partly broken away and in section of a modified form of this invention.

Figure ll is a sectional view taken on the line ll-ll of Figure l0.

Figure l2 is a longitudinal section showing another modification of this invention.

nite States Patent ice Figure 13 is a longitudinal section showing a further modification of this invention.

Figure 14 is a sectional view taken on 4the line 14-14 of Figure 13.

Referring to the drawings, the numeral 20 designates generally a shielded wire member which is formed of a central conductor 2i which is encased in an insulating member 22 and the insulating member 22 is encased in a woven or braided wire shield 23. A woven or braided fabric covering 24 engages about the shield, 23.

In order to provide a means whereby the shield 23 will be held against becoming frayer when the wire is skinned to expose the conductor 21, I have provided a shield termination as will be hereinafter described. In preparing the wire Ztl for receiving the termination, the shield 23 is cut back a short distance from the end of the insulating sheath 22.

The outer fabric covering 24 is also cut back a short distance from the end of the exposed shield 23. A conical shell 26 is slipped over the end of the wire and is positioned inwardly from the adjacent end of the fabric covering 24 as shown in Figure 3, and a ring 25 is then slipped over exposed shield 23 as shown inFigure 3.

rl`he end of the shield 23 is then bent reversely over the ring 25 as shown at 27 in Figure 4. A cap 28 having a central opening 29 through which the sheath 21 is adapted to loosely engage, is then extended over the sheath 2li and telescopes over the now covered ring 25.

The cap is formed initially with a plurality of clamping fingers and telescopes over the adjacent end of the fabric severing 24 as shown in Figure 5. The clamping lingers are then compressed inwardly to tight clamping engagement with the covering 24 as shown in Figure 6.

rThe shell 26 is then moved outwardly and engages a reduced diameter shoulder 31 which is formed at the inner of the cap 23. The base or large end of the Shell is adapted to frictionally and relatively tightly engage the shoulder 3l so that there will be no rotary or endwise movement between the cap 28 and the shell 26. The apex or inner end of the shell 26 is then constricted as indicated at 32 in Figure 8, so that the apex of the shell 26 will be tightly clamped about the fabric covering 24.

The completeiy assembled termination is shown in Figure 8 and in enlarged longitudinal section in Figure 9.

Referring now to Figures l() and ll, there is disclosed a modified form of this invention wherein the shell 26a is formed with a longitudinally offset channel 33 within which a ground wire 34 is adapted to engage.

The wire 34 is bared o-f insulation as indicated at 35 and the bare end 35 of wire 34 is extended through the conical end of the shell 26a, and is tightly clamped to the apex of the shell 26a as indicated at 32a, when the apex is clamped or otherwise constricted about the fabric.

covering 24a.

has an insulated ground wire 36 extending into the apex thereof and the ground wire 36 which may be a braided or twisted strand wire 37 is skinned adjacent the end thereof and the skinned end of the wire 36 is extended about the ring 251, and is adapted to engage within the cap 231.

Referring now to Figures 13 and 14, there is disclosed another modification of this invention, wherein a plurality of shielded conductors 3S are encased in a conical shell 26, with shell 26C engaging at the base or large end thereof about a cap 23C. Each wire 38 has engaging thereabout, a ring 25 and the bared shield 23c is extended interiorly and about the ring 250. A ground wire 39 is extended through the apex of the shell 26e and the bared n J M) end 40 of wire 39 is engaged about a selected one of the rings 25, which are encompassed Within the cap 28C.

The shield terminations hereinbefore described, can be easily and quickly mounted on either or both ends of a shielded wire so that the fabric covering and the shield will not fray out and the shield may, if desired, be grounded so as to eliminate eddying or stray currents.

What is claimed is:

1. in a cable having a central conductor, an insulating sheath about said conductor, a stranded metal shield about said sheath; a terminator for said shield comprising: a ring surrounding the shield, said shield being reverted over said ring, a cylindrical cap encompassing said ring and reverted shield, said cap having an opening at one end through which the conductor and the sheath extend, and .an opening at the other end through which the Ycomplete `cable extends, a plurality of resilient iingers extending from the other end of the cap to engage the outside surface ofthe cable in a tight, clamping relationship therewith, and a conical shell surrounding the fingers, with the larger end securely engaging the cap and the smaller end constricted onto the outside surface of the cable.

2. The device of claim 1 wherein the opening at one end is of a reduced diameter and forms a shoulder for retaining the reverted shield within the cap.

3. In combination a cable having a central conductor, an insulating sheath about said conductor, a stranded metal shield about said sheath, a terminator for said shield comprising a ring surrounding the shield, said shield being reverted over said ring, a cylindrical cap encompassing said ring and reverted shield, said cap having an opening at one end through which the conductor and the sheath extend, and an opening at the other end through which the complete cable extends, a plurality of resilient lingers extending from the other end of the cap to engage the outside surface of the cable in a tight clamping relationship therewith and a conical shell surrounding the lingers with the larger end securely engaging the cap and the smaller end constricted onto the outside surface of the cable, said shell having a longitudinal offset channel, and

Y a ground wire in said channel having an end thereof tightly gripped in the apex of said shell.

4. In combination a -cable having a central conductor, an insulating sheath about said conductor, a stranded metal shield about said sheath, and a terminator for said shield comprising a ring surrounding the shield, said shield being reverted over said ring, a cylindrical cap encompassing said ring and reverted shield, said cap having an opening at one end through which the conductor and the sheath extend, and an opening at the other end through which the complete cable extends, a plurality of resilient fingers extending from the other end of the cap to engage the outside surface of the cable in a tight clamping relationship therewith, and a conical shell surrounding the lingers with the larger end securely engaging the cap and the smaller end constricted onto the outside surface of the cable, and a ground wire extending into the apex of said shell with an end of the ground wire within said cap.

References Cited in the file of this patent UNITED STATES PATENTS 

